Wilcox crittenden seacocks - missing drain screws - SailNet Community
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post #1 of 23 Old 12-23-2013 Thread Starter
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Wilcox crittenden seacocks - missing drain screws

I'm missing several drain screws on my Wilcox Crittenden seacocks.

One rotted away due to a bonding wire that wasn't actually attached to anything except the drain screw!

They look like M6 in bronze, which appears to be impossible to find.

Has anyone found a source?

I have two alternatives :

Fill the holes with epoxy (no winter here, so no need to drain)

Install stainless or brass machine screws.

Any thoughts would be most welcome.

Bristol 31.1, San Francisco Bay
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post #2 of 23 Old 12-23-2013
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Re: Wilcox crittenden seacocks - missing drain screws

Hey I am in the same boat so to speak. Mine is also WC and are pretty corroded - it seems the PO could not find them either, so he used plain steel ones. Scary. I have not bought them yet and could not find anything (that I could trust) in bronze - some people call bronze brass. This what I found:

You have a choice of a grease fitting or plug and I think they are 1/8 npt:

Grease nipple
McMaster-Carr
Threaded plug
McMaster-Carr
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post #3 of 23 Old 12-23-2013
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Re: Wilcox crittenden seacocks - missing drain screws

Mark, I'd try any M6 screw first to see if that's the thread you need. If it is just a drain screw, you might also be able to get a nylon screw for it, which would end any corrosion problems too.

Of course, any real machine shop should be able to knock off some M6 threaded bronze rod for you and put some slots in for heads. Sometimes, they'll even do it cheap if you can come back to pick it up "next week".
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post #4 of 23 Old 12-25-2013
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Re: Wilcox crittenden seacocks - missing drain screws

I doubt they are metric. Wilcox Crittenden was American and metric was pretty rare in North America in their day - probably still is.

Brian
Living aboard in Victoria Harbour
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post #5 of 23 Old 12-25-2013
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Re: Wilcox crittenden seacocks - missing drain screws

I have been changing my WC seacocks to Spartan Marine bronze seacocks. I might have some of the WC drain screws. I will check this weekend and repost if I found the screws. I am not sure they have the screws that will fit but try this link Bronze and Stainless Marine Hardware - Spartan Marine Hardware and Accessories | Robinhood Marine Center
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post #6 of 23 Old 12-25-2013
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Re: Wilcox crittenden seacocks - missing drain screws

Check with Paul at Spartan bronze. IIRC Spartan uses the same oddball threaded bronze screws. From memory, and conversations with Paul, I recall the bronze screws are made from the same alloy as the seacock, which is 85-5-5-5 bronze. Those screws are simply not available on the open market and are custom made to match the alloy of the seacock..
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Last edited by Maine Sail; 12-26-2013 at 08:06 AM.
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post #7 of 23 Old 12-26-2013
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Re: Wilcox crittenden seacocks - missing drain screws

Is this a chronic problem with these seacocks? Mine corroded as well.. I got replacements from WC which appear to be correct, but they do not fit. I assumed there was still some corroded pieces of the old plug left. Are the seacocks themselves dissolving?
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post #8 of 23 Old 12-26-2013 Thread Starter
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Re: Wilcox crittenden seacocks - missing drain screws

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Originally Posted by ambianceack View Post
I have been changing my WC seacocks to Spartan Marine bronze seacocks. I might have some of the WC drain screws. I will check this weekend and repost if I found the screws. I am not sure they have the screws that will fit but try this link Bronze and Stainless Marine Hardware - Spartan Marine Hardware and Accessories | Robinhood Marine Center
Thanks, that would be very kind of you.

Bristol 31.1, San Francisco Bay
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post #9 of 23 Old 12-26-2013 Thread Starter
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Re: Wilcox crittenden seacocks - missing drain screws

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Is this a chronic problem with these seacocks? Mine corroded as well.. I got replacements from WC which appear to be correct, but they do not fit. I assumed there was still some corroded pieces of the old plug left. Are the seacocks themselves dissolving?
I believe they often corrode out when they are used as connection points for bonding. Interestingly, though, all the ones on through-hulls that are properly bonded are solid.

I one case I found that the bonding wire is disconnected elsewhere - so I had 2 feet of wire, that's all, connected to the drain screw. Both drain screws on that through-hull were badly corroded. Could that ungrounded length of wire promote galvanic corrosion?

Bristol 31.1, San Francisco Bay
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post #10 of 23 Old 12-28-2013
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Re: Wilcox crittenden seacocks - missing drain screws

So I only found 2 screws, if you want them please send a PM with your mailing address and I will drop them in the mail next week.
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